Yaskawa Matrix Converter - Manual (Page 221)

6
-56
Continuing Operation
This section explains functions for continuing or automatically restarting MxC operation even if an error
occurs.
‹ Restarting Automatically after Power is Restored
Even if a temporary power loss occurs, the MxC can restart automatically after power is restored to continue
motor operation.
To restart the MxC after power is restored, set L2-01 to 1 or 2.
If L2-01 is set to 1, when power is restored within the time set in L2-02, the MxC will restart. If the time set in
L2-02 is exceeded, alarm UV1 (main circuit undervoltage) will be detected.
If L2-01 is set to 2, when the main power supply is restored while the control power supply (i.e., power supply
to the control panel) is backed up, the MxC will restart. Consequently, alarm FDEV (power supply frequency
fault) will not be detected.
„ Related Parameters
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display V/f
Open
Loop
Vector
Flux
Vector
L2-01
Momentary Power
Loss Detection
Selection Enables and disables the momentary power
loss function.
0: Disabled. - MxC trips on (FDV) fault
when power is lost.
1: Power Loss Ridethrough Time - MxC will
restart if power returns within the time set
in L2-02.
2: CPU Power Active - MxC will restart if
power returns prior to control power sup-
ply shut down.
0 to 2 0 No A A A
PwrL Selection
L2-02
Momentary Power
Loss Ride-thru
Time
Sets the power loss ridethrough time. This
value is dependent on the capacity of the
MxC. Enabled only when L2-01 = 1.
0 to 2.5
0.5 s
*1
No A A A
PwrL Ridethru t
L2-03
Momentary Power
Loss Minimum
Base Block Time Sets the minimum time to wait to allow the
residual motor voltage to decay before the
MxC output turns back on during power loss
ridethrough. After a power loss, if L2-03 is
greater than L2-02, operation resumes after
the time set in L2-03.
0.1 to
5.0
0.7 s
*1
No A A A
PwrL Baseblock t
L2-04
Momentary Power
Loss Voltage
Recovery Ramp
Time
Sets the time it takes the output voltage to
return to the preset V/f pattern after speed
search (Current Detection Mode) is complete.
0.0 to
5.0
1.5 s
*1
No A A A
PwrL V/f Ramp t
L2-05
Undervoltage
Detection Level Sets the PS undervoltage trip level of the
MxC. If this is set lower than the default,
additional AC input reactance or PS voltage
may be necessary. Consult the factory before
changing this parameter setting.
150 to
210
*2
190
VDC
*2
No A A A
PUV Det Level
L2-13
Power frequency
fault detection gain Set the gain to detect a power frequency fault
(FDV).
If an FDV is detected when no momentary
power loss occurred, decrease the set value in
units of 0.1.
0.1 to
2.0
1.0 No A A A
FDV Gain